转换数据表到nestead类由LINQ

Question

我有如下嵌套类的定义：

[XmlRoot()] 
public class cars 
{ 
    [XmlElement(ElementName="car")] 
    public car[] carList { get; set; } 
} 
public class car 
{ 
    [XmlElement(ElementName = "manufacture")] 
    public string manufacture { get; set; } 
    [XmlElement(ElementName = "models")] 
    public models modelList { get; set; } 
} 
public class models 
{ 
    [XmlElement(ElementName = "model")] 
    public model[] modelList { get; set; } 
} 
public class model 
{ 
    [XmlElement(ElementName = "name")] 
    public string name { get; set; } 
    [XmlElement(ElementName = "color")] 
    public string color { get; set; } 
} 

我有一个数据表如下：

DataTable dt = new DataTable(); 
    dt.Columns.Add("Manufacture"); 
    dt.Columns.Add("ModelName"); 
    dt.Columns.Add("Color"); 

    Object[] rows = { 
     new Object[]{"P1","405","1,6"}, 
     new Object[]{"P1","406","1,7"}, 
     new Object[]{"P2","407","1,8"}， 
     new Object[]{"P2","408","1,9"} 
    }; 
    dt.Rows.Add(rows); 

我想我的数据在数据表转换为我的一流的汽车。 任何帮助，将不胜感激。
更新： 对于使用建议，我需要更改Rows.Add与下面的代码，否则，我只会得到结果中的对象。

  DataRow dr= dt.NewRow(); 
     dr["Manufacture"] = "Peugeot1"; 
     dr["ModelName"] = "405"; 
     dr["Color"] = "1,6"; 
     dt.Rows.Add(dr); 
     DataRow dr2 = dt.NewRow(); 
     dr2["Manufacture"] = "Peugeot1"; 
     dr2["ModelName"] = "406"; 
     dr2["Color"] = "1,7"; 
     dt.Rows.Add(dr2); 
     DataRow dr3 = dt.NewRow(); 
     dr3["Manufacture"] = "Peugeot2"; 
     dr3["ModelName"] = "405"; 
     dr3["Color"] = "1,6"; 
     dt.Rows.Add(dr3); 

Answer 1

使用GroupBy将所有由Manufacture行，然后为每个组项目的新Car。要填充ModelList财产上的组使用Select：

var result = (from row in dt.AsEnumerable() 
       group row by row.Field<string>("Manufacture") into grouping 
       select new Car 
       { 
        Manufacture = grouping.Key, 
        ModelList = grouping.Select(item => new Model 
        { 
         Name = item.Field<string>("ModelName"), 
         Color = item.Field<string>("Color") 
        }).ToArray() 
       }).ToList(); 

您还可以使用与GroupBy过载的方法来调用，您可以指定一个选择谓词：

var result = dt.AsEnumerable() 
       .GroupBy(row => row.Field<string>("Manufacture"), 
         row => new Model 
         { 
          Name = row.Field<string>("ModelName"), 
          Color = row.Field<string>("Color") 
         }) 
       .Select(group => new Car 
       { 
        Manufacture = group.Key, 
        ModelList = group.ToArray() 
       }).ToList(); 

请注意，我有变化类和属性名相匹配的C＃命名约定